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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511e53df508a841d34083eb5a109046815039ccd70f07ccdc42b872aced9faa3' 
  AND token = 'cN7Jz/AVDiW4plrP7ZAmwofHhZpoDWRpfJ1p1tZzdpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}